was constructed for Matich to contest the 1973 L&M Championship in the United States. Chassis 005 was used by Lella Lombardi in 2 races in 1974 and was later sold to John Goss who rebuilt it as an A53 and used it to win the 1976 Australian Grand Prix. Chassis 006 was modified and became the A52. A52 Matich built a revised car, the Matich A52, using A51-006 monocoque for the 1973 Australian Drivers' Championship. The A52 had side radiators, a shorter wheelbase, shorter nose and updated suspension. After just a single race, Matich withdrew from the championship and put his cars up for sale. It was later wrecked in a testing accident. A53 The Matich A53 was raced by Matich in the 1974 Tasman Series after which he retired from racing. The car was then sold to John Goss who finished 9th in the 1974 Australian Drivers' Championship. It failed to start the 1974 Australian Grand Prix at Oran Park due to engine failure. Goss then used the A53 to finish 13th in the 1975 Australian Drivers' Championship before poor visibility in the wet conditions and a rough engine caused his retirement in the 1975 Australian Grand Prix at Surfers Paradise. Goss drove the car to 5th in the 1976 Rothmans International Series and then finished 6th in the 1976 Australian Drivers' Championship thanks to his Round 1 victory in the 1976 Australian Grand Prix at Sandown in Melbourne, Goss becoming the only driver to have won both the Bathurst 1000 and Australian Grand Prix in the process. Goss drove the A53-Repco to another 5th in the 1977 Rothmans International Series and 3rd in the 1977 Australian Grand Prix at Oran Park. Goss' win in the 1976 Australian Grand Prix has so far proven to be the last time the race was won by an Australian designed, built and powered car, giving the Matich A53 a special place in Australia's motor racing history. Note that the Ralt cars that won the 1981-1984 Australian Grand Prix's were designed and built in England, despite Ralt having its origins in Australia in the 1950s, Late in 1977, Goss, staying true to his touring, sports car/sedan ties, decided to replace the successful, but ageing Repco Holden V8 engine with a 4.9 L Ford engine. However, the Ford engine provided less power and ultimately proved uncompetitive compared to the Repco and, after Goss sold